Current Electricity and Electrical InstrumentHard
Question
The emf and internal resistance of three batteries as shown in figure is :
Options
A.2 V, 1Ω
B.2 V, 1Ω
C.2 V, 1.5Ω
D.4 V, 2Ω
Solution
E =
= 1 volt and r =
= 1Ω . Therefore 
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